Look at the unit circle shown below.

If the point starts at and rotates counterclockwise, which statement is TRUE?

a) x=cosθ and y=sinθ and both functions have a period of π.

b) x=sinθ and y=cosθ and both functions have a period of 2π

c) x=sinθ and y=cosθ and both functions have a period of π

d) x=sinθ and y=cosθ and both functions have a period of 2π